Open-hearth furnace



1. O. GRIGGS.

OPEN. HEARTH FURNACE.

APPLICATION FILED. J.ULY7. 19:9.

1 ,353B3U. 1 Patemed $55M}. 28, 1920.

2 SHEETS-SHEET I. I

L 0. GRIGGS.

OPEN HEARTH FURNACE.

APPLICATION FILED mwz. 1919.

menmase t. 28,1920.

2 SHEETS-SHEET 2.

w mlhivliuwpillli 1 ber 25, 1918, Serial No. 259,688, and open 3O I hearthfurnaces with portable, removable and. replaceable back wall's,;,and this invention consists ina removable and replaceable back wall having means whereby it may be JOHN 0. Games, or YOUNGSTOWN, oz-uo.

' OPEN-HEARTI-I run-mien;

a To aZZ whom itmay concern...

: 1 naces and ithas particular reference to the back walls ;=thereof.

such furnaces, the back wall deteriorates in .ashortt1me,:falls inand causes considerable V Ordinarily the back walls of openhearth furnaces are constructed vof firebrick, reinforced by. buck'stays, and because of the intense heat developedin damage and loss of time- I have overcome these 0b ect1onable features by PI'OVldlIlg auxiliary walls or substitute walls, which.

can-be-quickly installed in place when the sections I Referring to. said drawings, the: reference character A designatesthe arch or roof of the furnace, having the usual skew back channel v-iron beam IBralongits side edges;

original wall becomes dangerous or fallsin,

andsuch constructions are fully disclosed in 'my prior applications for patents on shlelds or auxiliary'walls for furnaces, filed Octohearthfurnaces, filed January- 20, 1919, Se; rial No. 272,001. a

v I have found that a great saving of time and labor may be had by providing open readily'and easily carried'to' and ,from' the furnace, and put inplace therein or remov'ed therefrom, It further consists in theseveral novel features hereinafter fully set forth and claimed. -f i The invention is clearly'illustrated in th'e" accompanyingdrawings, in which 1 Figure 1 1s a View partlyan plan and partly in horizontal section of -.-an .open

hearth furnace embodying asimple formof the presentinvention, the line of section be ing shown at 1 1 in Fig. 2; Figf2is a side elevation of a'fragment of the furnace; Fig. 3,;isa vertical cross section 'taken ODKliIIQ 3- 3 of Fig. 2, and Fig. 4 is a view partly in elevationand partlyin crosssection of a wall carrying arm, and one ofthe backwall Specification of Letters Patent." Patented 28,1920. Application filed July 7, 1919. team. 302,993. v

C designates the stays, and D,-

wise extending beams secured to the topsof the buck stays. Located considerablybelowthe marginal edge of the arch or-roof. A and skew back channel iron beam is a; wall E and between .saidfwall- E and skew 1 back channel ron beam is an open ng F, extendinglengthwise of the furnace in which are removably secured the portable back wall sections G. Said back wall sectionsare sup: ported behind the buck} stays C, and com-I pletely close theopening F from end to end. Refractory material H. may be used toclose any crevices between the backwall sections and adjacent. parts ofthefurnace.

The exact construction of the back wall sections {is immaterial to; this invention, broadly cons dered, and if desired they may be water cooled'as is clearly set forth in my priorapplication on open hearth furnaces,

filed June 2, 1919, Serial No. 301,257? As illustrated, each section comprises a wall vor facing '5 of fire brick orother refractory material and a hollow supporting framefi therefor which acts as a water jacket,

through which water is circulated to cool the back wall. The frame 6 has a rectangu lar shoulder or projection surrounding the fi-rebrick or facing 5, and the fire bricks are securely held in place in the frame-like'pr jection and w-ith'rsaidjackets constitutesthe: back wall. The water jacket of theframefi may be dispensed with, if desirabl e,ybutfit prolongs the life of' the back wall, and enin the back wall. I The back wall sections-,G mayl be removably supported in any suitablemannen'and I have illustrated rods for this purpose,

whicharesuspended from thebeams D by ables me to-use a cheaper grade of firebrick f cross bars 9. The back wall sections Gr have 9 horizontal webs or flanges lOformedthereon with which the lower" ends of the rods .engage,: and preferably; said webs are formed .with= notches- 11' intheir forward' 'edges whereby therodskma'y be quickly: connected i to the sections installingrthem in: place.

The lower endsof the rods 'may be formed with heads engaging the. lower sides of the threaded upper endsoftherods" which may be ti htened to draw the-sections upiagainst Below-thewebof each back wall section isa web or flange 1-2, and in said-webs-lO,

12 are .forrned alined, apertures -l3, 14, the E.

webs. and-nuts maybe secured upomthepurpose of which will be presently explained.

In case any section or all or them become 7 deteriorated after long continued usage and there is danger of the bricks falling into the furnace, or if they have fallen in, such section orsec tions may be instantly replaced by a fresh one, without the necessity of shutting down the furnace and permitting the heat to freeze and become solidified, it being understood that the heat issuing 7 from a break or opening in the wall'is so vention it is unnecessary for the workmen to a reach the oaening in the wall but the worn section may be removed and renaces.

placed by workmen located far enough away from the opening in the furnace wall to be comfortable. This I have accomplished by providing a wall carrying arm 15' of substantial construction, capable of supporting a back wall section, and which may be transported by a crane or other hoisting machinery such as is commonly used-in plants employing openohearth fur- Said arm is provided with perforated ears 16, 17 arranged in pairs as shown in Fig. 4, that are arranged to be slipped over the webs 10, 12of any back wall section, and removably and pivotally connected thereto by a pin 18. The arm 15 is provided, intermediate its ends, with an apertured bracket 19 to which may be secured a cable or other connection 20 that is attached to the crane hook 21, the cables of which pass up to the drum mechanism of the crane. A counter-weight 22 is attached to the end of the arm opposite the one carrying the back wall section, and if desired the cable 20 may be attached to the arm at the counter-weight to prevent it from suddenly tipping up the other end when the load is removed.

Any number of the back wall-sections may befurnished with a furnace, and may be stored conveniently close to the furnace. When the fire brick of a back wall section burns out, or has deteriorated to such an extent as to be unfit for further use, the arm 15 is attached to a fresh section, the hook of the crane attached to the arm .15 and the section moved to a place adjacent the worn section. The arm is then detached from the fresh section, raised by the crane andattached to the worn section by sliding the ears 16, 17 over the webs 10, 12, and thrusting the pin 18 through the apertures thereof. The bolts 8 are then removed from the web 10 and the weight of the section is then borne by the counter-weighted arm 15. The crane is then operated to first pushthe back 'wall' section into the furnace far enough to disengage itwith. adjacent sections or other parts of the furnace, after which the crane is moved lengthwise of the furnace until one end of the back wall section clears the adjacent buck stays, whereupon the crane is moved transversely of the furnace to draw the back'wall section out through the opening in the back wall. While being drawn out one end will strike the buck stays but the other end is free to move out through the opening, the buck stay acting as a fulcrum about which the section is swung the crane to pull it out through the opening. V7hen removed, it'is lowered, the arm detached therefrom and attached to the'fresh section'and the latter raised and inserted through the opening. While inserting it, it may be placed at an angle to the arm so as to pass freely between the buck stays and when it has been inserted far enough to clear the buck stays the crane is moved lengthwise of the furnace to bring one end of the section behind the buck stays (see dotted lines in Fig. 1) and then moved transversely of the furnace, thus pulling the section forward .into place between adjacent sections or other parts of the furnace. The rods 8 are thereupon attached to the web 10, the nuts thereon tightened up and the arm detached from the section. When a water jacket is used, the water connections are made as explained in my prior application. The fire brick in the used section may be replaced with new fire brick and thus the frame of the section may be used repeatedly.

.lt will be seen that injured back walls may be instantly replaced, permitting the heat to go on during the short time required to replace the injuredsection, that the life of the furnace is increased and that the operation thereof may bepractically continuous until the'furnace is completely worn out.

More or less variation of the exact details of construction is possible without departing from the spirit of this invention; T desire, therefore, not to limit myself to the exact form of the construction shown and described, but intend, in the following claims, to point out all of the invention disclosed herein.

.1 claim as new and Letters Patent:

1. In an open hearth furnace, having a back wall opening extending lengthwise thereof, and buck stays crossing said opening,-a plurality of portable back wall sections adapted to be arranged, end to end, he hind said buck stays to close said opening, each section comprising a rigid structure capable of being inserted in place and removed therefrom, and means for supporting said sections behind the buck stays, detachably connected with the sections.

.' 2. In an open hearth furnace, having a desire to secure by back wall Opening extending lengthwise thereof, and buck stays crossing said opening, a plurality of portable back wall sections adapted to be arranged, end to end,.

means for supporting said sections behind the buck stays, detachably, connected with e the sections.

3. In ancopen hearth furnacdhaving a back wall opening extending lengthwise thereof, and buck stays crossing said opening, a plurality of portable back wall sections adaptedto be arranged, end to end, be-

hind said buck stays to close said opening,

each section comprising a rigid structure capableof beinginserted in place and re-' moved therefrom and having a wall of refractory material carried by a frame and means for supporting said sectionsbehind the buckstays, detachably connected with the sections. 7 I I l. In an open hearth furnace, having a c back wall opening extending lengthwise thereof, and buck stays crossing said opening, a plurality of portable back wall sections, adapted to be arranged, end to end, behind said buck stays to close said opening, each section comprising a rigid structure, capablebfbeing inserted in place and removed therefrom and having a wall of refractory material carried by a water jacket, and means for supporting said sections behind the buck stays, detachably connected with the sections.

5. In an open hearth furnace, having a back wall opening extending lengthwise thereof and buck stays crossing said opening, a plurality of portable water-cooled back wall sections, adapted 'to be arranged,

end to end, behind said buck stays to close said openings, each section comprising a rigid structure capable of being inserted in place and removed therefrom, and means forsupporting said sections behmd the buck tions.

' I 6. In an openhearth furnace,having a back wall opening extending lengthwise thereof,

and buck stays crossingsaid opening, a plurality of portable back wall sections, adapted mg, each section comprising a rigid struc-- stays to close said opening, each section comprising a rigid structure, capable of being inserted in place, and removed therefrom, there being upper and'lower 'apertured webs on the outer faces of said sections for attachment to supporting means, and to traveling handling means:

7. In an open hearth furnace, having a back; wall opening extending lengthwise V thereof, and buck stays crossing said open ing, a plurality of porta'blebac k wall sec-' tions, adapted to be arranged, end to end,

behind said buck stays to close said opening, each section comprising a rigid-strum.

ture capable-of beinginserted-inplace and removed therefrom, there being webs on the outer faces of the-sections, and an arm capable of attachment to said webssubstan 'tially as and for the purpose set forth.

8. In an open hearth furnace, having a back wall opening extending lengthwise thereof, and buck stays crossing said opening, a plurality of portable backwallsections, adapted to be arranged, end to end, i

behind said buck stays to close said opening, each section comprising airigidvstruc ture, capable of being inserted in place and removed therefrom, there be ng webs onv the outer faces of the sections, and a counter: weighted movable arm having-a detachable connection with said webs, {substantiallyas and for the purpose set forth. I

9. In an open hearth furnace,fthe com-V bination of the furnace archand buck stays,

of removable and replaceable rigi-dflback wall'sections, set end to end behind said buck stays, and means for'removably supporting said sections behind the buck stays.

10.?In an open hearth furnace having spaced buck stays at'its back wall, a port-- able, removable and replaceable back wall extending behind said buck stays and a hind said buck stays; Y 1 11. In an open hearth furnace having spaced buck stays at its backwall, a port-' stays, detachably-connected with the sec-' able, removable and replaceable back wall extending behind said buck stays and a the furnace behind said buck sta s.

' JOI-IN O RIGGS.

dirigible arm detachably secured thereto, mwhereby said wall may be handled in removing it or replacing it in the furnace be- 

